JSTL adding null option inside select element

Question

I build a line <tr> using Angularjs and JSTL, and within this line I have an element select where it is travelled by using <c:forEach> over an enumerator to fill it when the user clicks to insert a new row.

<td><select name='atributos[{{$index}}].atributo' class='text large form-control' ng-model='atributo.tipo' ><option value='' selected><spring:message code='------------'/></option><c:forEach var='tipoAtributo' items='${EnumTipoAtributo}' varStatus='loop'><option value='${tipoAtributo.id}'><spring:message code='${tipoAtributo.label}'/></option></c:forEach></select></td>

But select stays that way:

Look at the first option, that is, in the element <option value="? object:null ?"></option>.

When I click to send the form, as there is a validation with a Hibernate annotation, the following error pops up, instead of a message like The Field is required:

Failed to Convert Property value of type java.lang.String to required type com.projecto.enums.Enumtipoattribute for Property attributes[0]. tipo; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type java.lang.String to type @javax.persistence.Column @javax.validation.constraints.NotNull @javax.persistence.Enumerated com.projeto.enums.EnumTipoAtributo for value ? Object:null ? ; nested Exception is java.lang.Illegalargumentexception: No Enum Constant com.projecto.enums.EnumTipoAtributo.? Object:null ?

When returning to the page this element is deleted and leave blank the validation message appears normally to the user in a way that can understand it, but how can I remove this element with value object:null?

Answer 1

This section does not point to the problem?

Failed to Convert Property value of type java.lang.String to required type com.projecto.enums.Enumtypattribute

A conversion is missing in this code, since it is expected a Enum and is being received a String.